Cantilever RC retaining wall on Rock without a base

I've done something similar about 30 years ago, but had a small 16" wide footing (it may have been 24") on the bottom... just to provide a flat base for the wall formwork.

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So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

I've never thought of doing this, but I guess it could work. I would have questions though....

How do you figure out the embedment length of the dowels?

If it were concrete, then I think you would need the full Ld development length. But...will your epoxy stick to the rock and get you fully developed in the same distance?

What is the rupture strength of the rock? Once you get the dowels developed, you have to make sure you don't have a rock breakout failure.

You don't provide alot of info. here. At least some dimensions (ht of RW , rock quality ..) will be helpful to get better responds.
My initial respond would be , the proposed anchorage system 'may ' work but the base shear is a question. I have designed a very similar case long years ago.

I preferred rock socketed pier with 3m separation and depth was about 1.5 m . ( The design is similar to the precast socket foundation design ).

I will suggest you to look ,
- Foundations on Rock (Duncan C Wyllie )
- Rock-Socketed-Shafts (nchrp_syn_360 )





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Make it do, or do without.

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This seems like a conceptually easy problem (but practically difficult!)

The overturning demand is pretty straightforward to calculate - now, can you take that out over your proposed lever arm?
How confident are you in the rock capacity?
How confident are you in the bond capacity?
What's the likelihood of longer term durability failure - the rock-concrete interface seems like an obvious flow point for moisture, can it get through and corrode the bars?

Gut feel is that it's possible but I don't like the look of it - I prefer the surety of a proper footing or a rock socket

Hilti didn't have tested values into rock, at least there wasn't as of 5 years ago. You could look into doing some pull tests on site if you want to dowel the bars like that instead of using a ftg with or without rock anchors. I don't think I would propose embedding the wall.